Bar's Leaks Radiator Stop Leak 11 oz, 4 Pack

Bar’s Leaks Radiator Stop Leak seals internal, external and coolant-to-oil leaks. It is specially formulated to seal larger leaks better than other stop leak products. Works safely and effectively on plastic, aluminum and metal radiators, heater cores, blocks, heads, gaskets and freeze plugs. Water Pump Lube lubricates water pump seal and inhibits the formation of rust and scale. Compatible with both conventional silicate-based and extended life (OAT/HOAT) antifreeze, all types and colors. Can also be used in straight water. Dissolved pelletized formula.